Door-operating mechanism.



'J. E. OSMER. DOOR OPERATING MECHANISM. APPLICATION FILED JULY 28,1906.

Patented Sept. 29, 1908.

2 SHEETSSHEET 1 Patented Sept. 29, 1908.

2 SHEETS-SHEET 2.

To all whom it may concern:

citizen of the United States,

' specification.

UNITED STATES PATENT OFFICE.

JOHN E. OSMER, OF CHICAGO, ILLINOIS, ASSIGNOR TO ELEVATOR SUPPLY & REPAIR OOMPANY, OF CHICAGO, ILLINOIS, A

CORPORATION.

noomornanrmo men-Amen.

E. OSMER, a

residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Door -'.Operating Mechanisms, of which the following is a Be it known that I, JOHN This invention relates to means for opening and closing a door, and the embodiment herein shown of the invention is particularly intended for opening and closing'the sliding doors commonly used upon elevated and other railway cars.

One of the objects of this invention is an1sm in which a single volume of pressure a1r isemployed to roduce the required reclprocatlon y expan in said air first in one (the high pressure) cy inder, and afterward further expandin other (the lowpressurs cylinder.

A further object of the invention is the PI'OVlSlOIl of 'a door-operating mechanism- 1n any convenient POSI- which may be placed tion within the car. i

The invention also relates to the other features of improvement in a door-operating mechanism hereinafter set forth. In the accompanying drawings. Figure 1 1s a side elevation of a door-operating mechanism embodying the features of my invention, said mechanism being illustrated in operative relation to a door. 'Fig; 2 is a top plan view of said door-operating mechamsm. tral section through [saidmechanism. Fig.

Fig. 3 is a longitudinal vertical cen- 4 is a transverse vertical section through the motor comprised in this door-operating mechanism.

' This invention is herein shown as employed for opening and closing one of the side doors of a railway coach, though it will be understood that, the invention may be readily adapted for the o eration of'other types of doors, as well as or giving a recipocatin or' swinging movement. to various other evices. anism comprises a motor '1 operatively-connected to the door -A bymeans to be herein'after described. The 'motor .1 may be 10- cated close to one of the side walls-of the car and upon or near the floor, as herein shown, or said motor maybe Inverted and Specification of Letters Patent. Application and m as, 1906. Serial, No. 828,264.

. in the the same air in'an-- The door-operating me'ch- Patented Sept. 29, 1908.

attached to the wall at a point near the ceiling. The motor comprises a high pressure cylinder 2 and a low pressure cylinder 3 arranged in tandem, said cylinders, in this instance, being formed of an integral casting. Lugs 4 cast integral with the cylinders 2 and 3 provide means for securing the motor to itssupport. Within the cylinders 2 and v3 are mounted pistons 5 and 6, respectively, said pistonsbeing located at oposite ends of a rack bar 7 having rack teeth ormed upon its upper side. The piston 5,

resent embodiment, is formed integ l'al with one end of a tie-rod 8 extending t rough a longitudinal opening 9 in the rack-bar 7, a nut 10 turned upon the screwthreaded end of said tie-rod outside of the piston' 6 securing said pistons and rack-bar firmly together. 4

The rack'bar 7 has a disk 11 formed thereon adjacent to the piston 6, said disk being provided with a semi cylindrical shoe 12 adapted to slide upon the lower part of the inner surface of the cylinder 3. At the opposite end of the rack bar 7 is formed a shoe 13 ada ted to slide upon the lower walls of the cyl nder 2. The pistons 5 and 6 are provided with suitable packing (not herein shownin .detail) to prevent leakage of the pressure fluid past said pistons. The rack bar 7 is supported intermediate its ends upon aroller 14 rotatably mounted upon ashaft 15 lying within openings 16 in the cylinder casting; An opening17 is formed in the lower side of said casting to permit of placing the roller 14 in position.

Upon the upper side of the low-pressure cylinder 3-near the outer end thereof is located the valve mechanism that controls the passage of air to and from both cylinders. The valve chest 18 is connected with any suitablesource of pressure fluid such as an air compressor, by means of an inlet pipe .19; with the low-pressure cylinder 3 by a port 20; with the high-pressure cylinder2 by 9. ipe 21; and with the exhaust by a port 22. he slide valve 23 is adapted to p ace the high pressure cylinder in communication with thesourceof low-pressure cylinder in communication w th the exhaust; and to establ sh communicatlon between the high-pressure p linderand the low-pressure cylinder Sal slide valve isreciprooated in any suitable way, as by means pressure supply and the of a crank 24 operatively connected to a controller (not shown) located wlthin con- .venient reach of the operator.

Said shaft has fixed thereto a pinion 27 adapted to mesh with the rack bar 7, the cylinders 2 and 3 having a slot 28 formed therein for the reception of said pinion. A lever 29 is ri idly mounted at one of its ends u 'on one en of the shaft 26, the other end 0 said lever being connected with the door A by means of 'a link 30.

v To permit the door to be yieldingly stopped, so as to prevent injury to a passenger who might have his hand in the doorway when the door is being closed, the link 30 is made in two telescoping sections 31 and 32, the section 31 being bifurcated at one end for attachment to the lever 29. The opposite end of the link section 31 is reduced in diameter, providing an annular shoulder 33, between which shoulder and a pin 34: fixed in the tubular section 32 of the link is interposed a coiled s ing 35. To limit the movement of the lin -sections 31 and 32 with relation to each other a pin 36 is fixed in the section 31 with its ends lying within slotted openings 37 in the link-section 32.

38 is' a stop supported from the floor or attached to the wall of a car in suitable position to limit the closing movement of the lever 29, said lever and the link 30 being in alinement when the door is fully closed.

Assuming the door to be open, the lever 29 swung to its extreme right-hand position (as shownin dotted lines in Fig. 1), and the pistons 5 and 6 consequently in the left-hand ends of their respective cylinders, the operation of the device is as follows: The operator moves the slide valve 23 to connect the highpressure cylinder 2 with the source of pressure supply and the low-pressure cylmder with the exhaust. The admission of the pressure fluid Within the high-pressure cylinder 2 forces the pistons 5 and 6 toward the right (F i 3), swinging the lever toward the left ig. 1) and closing the door. The lever 29 and link 30 are so proportioned that when the door is fully closed said lever and link are in alinement, thus locking said door in its closed position. When it 1s desirable to open the door, the operator moves the slide .valve 23 into position to establish communication between the high-pressure cylinder 2 and the low-pressure cylinder 3,

and close communication between the atmos' phere and the lowressure cylinder 3. The

piston 6 within t e low-plressure cylinder aving a larger-area than t e piston 5 in the high-pressure cylinder, the pressure exerted upon the piston 6 will be greater than the p re exerted dpon the piston 5, causing a movement of sai pistons toward the left (Fig. 3) and moving the lever 29 in the direction to open the door. It will thus be seen that one charge or volume of pressure fluid is used to obtain one complete (double) reciprocation of the door.

It is obvious that the motor herein shown a may be used to operate railway switches and various other devices havmg a reversing or reciprocatory movement. It is also apparent that various changes may be made in the construction and arrangement of the parts of the door-operating mechanism herelnbefore described without departing from the spirit of the invention. I therefore desire to have it understood that I do not limit myself to the precise details herein set forth.

I claim as my invention:

1: In a mechanism for operating a door or other device, in combination, a high pressure cylinder and a low pressure cylinder; a valve mechanism for placing sai high pressure cylinder in connection with a source of pressure fluid, for connecting said cylinders together, and for connecting said low pressure cylinder with the exhaust; pistons for said cylinders; a rack bar connecting said pistons; a pinion adapted to mesh with said rack bar; and an operative connection betwepn said pinion and the device to be operate 2. In a mechanism for operating a door or other device, in combination a high pressure cylinder and a low pressure cylinder; a valve mechanism for said cylinders; pistons for said cylinders; a rack bar connecting said pistons; bearing lugs fixed with relation to said cylinders; a shaft supported in said bearing lugs; a pinion fixed to said shaft and meshing with said rack bar; and a lever fixed to said shaft and operatively connected with the device to be moved.

3. In a mechanism for operating a door or other device, in combination, a high-pressure and a low-pressure cylinder; a valve mechanism for said cylinders adapted to place them in communication at intervals pistons for said cylinders; a rack bar connecting said pistons; a pinion adapted to mesh with said rack bar; and an operative connection between said pinion and the device to be operated.

' 4. In a mechanism for operating a door or other device, in combination, a hi h-pressure cylinder and a low-pressure cylin er; a valve mechanism for said cylinders; pistons for said cylinders; a rack bar connecting said pistons; an openin being formed in the adacent ends of sai cylinders; bearin lugs 5. In a mechanism for operatinf a door or other device, the combination 0 the high pressure cylinder and the low pressure cylinder arranged in tandem, the opposing ends of said cylinders being open 'to'the atmosphere, an operating rod extending-between the opposing ends of said cylinders and pro vided at its opposite ends with pistons for said cylinders, suitable means forthe admis- 10 sion and escape of motor fluid to and from JOHN E. os MER.

Witnesses:

L. L. MILLER, y f

' GEORGE L. CHINDAHL. 

